Disinfectant.



' PAUL rnnmmme, or namnunaennmm.

msrmrnc'rimr.

1,162 152 Specification of Letters Patent.

No Drawing.

To all' whom z'tmey concern.

Be it known that I, Dr. PAUL FLEMMING,

chemist, citizen of Germany, subject of the German Emperor, residing at Moorfurtweg 13-15, in the free town of Hamburg, in the v v State of Hamburg and Empire of Germany, -have invented new and useful Improve- I ments in Disinfectants, of which the following is a specification.

The chlorinated cresols are known as having an extraordinarily strong disinfectant efi'ect. Also chlorinated xylenols display an i enormously strong bactericidal effect and this. exceeds, as has--been established, even that of pchloro-m-cresol whichis especially well known as a disinfectant. The surprising discovery has now been made that by mixing together the two kinds of disinfect ant substances, viz, clorinated cresol with chlorinated xylenol the disinfectant effect is immensely increased. A succession of bacteriological experiments has correspondingly demonstrated that mixtures of chloro-xylenol with .chloro-cresol are bacteriologically approximately double as effective as the same quantities of the same chloro-xylenol or chloro-cresol by themselves. This is clearly shown from the following table which sets forth the results of.

exact bacteriological examinations of different chlorinated xylenols and cresols referred to pure carbolic acid and in which a sign in the usual way signifies that the reaction has resulted positively i. e. that living bacteria still survive, while a sign shows the negative result of the reactionthe killingof all bacteria. The substances in question were made soluble in water by treatment with alkali and glycerids in the known manner.

Table.

Determination of the disinfectant value with Bacillus typh'osus compared with phenol as unit. Execution, 6 drops of 24 hour bouillon culture to 10 com. disinfectant solution. Subcultures 10 com. nutrient bouil- PatentedNov. L30, 1915.

Application filed January 26,- 1914. Serial No. 814,539.. i

lon, carrying over diameter loop.

Re'sults registered after.-4 hours...

It has been found that in all'cases the disinfectant efi'ect of a mixture of chlorinatedxylenol and chlorinated cresol is by far higher than the effect of one of the components of the mixture even if added to that of the other component. Similar results are also obtained from examination of different preparations of such a mixture 6. g. if instead of the soap solutions alcoholic solutions or solutions of the corre-' sponding alkali salts are employed, the mixture always shows itself to be of stronger effect than could have been foreseen from the effect of the components employed.

An observation deserving especial notice is that for the manufacture of such disinfectants'instead of chlorinated cresols their Duration of igifiuence Catholic acid 7 coeflicients. 6 12 18 24 30 Phenol 1:125.. Phenol.....' ..1:110.. Ghl 1MP fig oro-o-creso, 200 484 mi Phenol ..1:125.. Phenol ..1:110..

1:200.. Chloro-xylenol,M.P. 1:400- 800 1:800.. Ch1oro-o-cres01,M.P.- 1:200..

4s-49 chloro-xy-1:400.. 55

lenol, .P.117,to- 11500.. L ii)- getherl o 1:800.. Chloro-xylenoLMI. 12200..

73, hloro-m- 11400.. 4 cresol, .P.66,to- 1:600.. 12 gether12%....'. ..'1:800..

- Effect change- 1:200.. able on ac- Ohloro-xyIenoi,M.P. 1:400.. countoisep- 73,12%... 1:600.. arat'ions.

- 1:s00.. pp'm mately 4. p-Chl I 1MJi iiil i i oro-m-creso, .2 A prox- P. 66,12% 1:600. n iately 3.

. 11800.. 0h1oro-o-cresol,M.P. 1:200.. 48-49 chloro-xy-l 1:400. 600 55 lenol, .P.73,to- 12600.. 110 gather 12% 1:800..

{complex alkali salts according to U. out No. 1,036,087 may with a'dvanta e be.

SPatemployed and it has been found that thereit was understood hitherto that free phenols by no increase of corrosive effect or prejudice to bactericidal strength arises. Thiswas by no means to be anticipated because developed aless considerable corrosive action with higher bactericidal strength than their alkali salts (compare Schneider: Zeit- .SGhTift fdrvHg giene and lnfektionskmnk water by means of soap the possibility is attained of using essentially less soap than when the corresponding free chloro-cresols are employed. As the chlorinated xylenols need proportionately much soap in order, even in the case of large dilution, to be kept permanently in solution so there is in the joint employment of thecomplex" alkali salts of the chloro-cresols not only a saving but also in addition an advantagefwith reference to the physical quality, of the new disinfectant. "The mixture of chloro-cresol and chloro-xylenol provides a, disinfectant of strong eifect in small quantity.

I shown in the table given preparations which for example only contain 12% of a molecular mixture of symmetrical chloroxylenol and p-chloro-m-cresol have all eady an effect approximately six times as strong -as"1 00% pure carbolic acid. The latter is,

however as is well known, in dilutions capable of being used as disinfectants strongly corrosive and poisonous whereas the aforesaid mixturesin consequence of their small content of active substance are absolutely free from risk or harm to the user. Moreover bothsymmetrical chloro-Xylenol and also 'p-chloro-m-cresol are considerably less poisonous than carbolic acid andthe corrosive effect is less. The proportion of each of the two components of the disinfecting compound may be from 1 to 50%.

Having now described my invention what I claim and desire to secure by Letters Patent of'the United States is: 1. A disinfectant compound comprising chlorinated xtylenol and chlorinated creso '2. A disin I ectant compoundcomprising chlorinated xylenol and chlorinated cresol,

.the chlorinated cresol being employed in the form of-a double compound of a chloro- .cresol alkali salt with free chloro-cresol.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses; a

DR. PAUL FLEMMING. a

Witnesses: m a

' E. .H. L. MUMMENHOFF,

- EDUARD HOPF. 

